﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;
using System.Xml;

namespace MpSoft.Basic.Utils
{
   public class XmlHelper
    {
        #region Methods
        /// <summary>
        /// XML Encode
        /// </summary>
        /// <param name="s">String</param>
        /// <returns>Encoded string</returns>
        public static string XmlEncode(string s)
        {
            if (s == null)
                return null;
            s = Regex.Replace(s, @"[^\u0009\u000A\u000D\u0020-\uD7FF\uE000-\uFFFD]", "", RegexOptions.Compiled);
            return XmlEncodeAsIs(s);
        }

        /// <summary>
        /// XML Encode as is
        /// </summary>
        /// <param name="s">String</param>
        /// <returns>Encoded string</returns>
        public static string XmlEncodeAsIs(string s)
        {
            if (s == null)
                return null;
            StringWriter sw = new StringWriter();
            XmlTextWriter xwr = new XmlTextWriter(sw);
            xwr.WriteString(s);
            String sTmp = sw.ToString();
            xwr.Close();
            sw.Close();
            return sTmp;
        }

        /// <summary>
        /// Encodes an attribute
        /// </summary>
        /// <param name="s">Attribute</param>
        /// <returns>Encoded attribute</returns>
        public static string XmlEncodeAttribute(string s)
        {
            if (s == null)
                return null;
            s = Regex.Replace(s, @"[^\u0009\u000A\u000D\u0020-\uD7FF\uE000-\uFFFD]", "", RegexOptions.Compiled);
            return XmlEncodeAttributeAsIs(s);
        }

        /// <summary>
        /// Encodes an attribute as is
        /// </summary>
        /// <param name="s">Attribute</param>
        /// <returns>Encoded attribute</returns>
        public static string XmlEncodeAttributeAsIs(string s)
        {
            return XmlEncodeAsIs(s).Replace("\"", "&quot;");
        }

        /// <summary>
        /// Decodes an attribute
        /// </summary>
        /// <param name="s">Attribute</param>
        /// <returns>Decoded attribute</returns>
        static public string XmlDecode(string s)
        {
            StringBuilder sb = new StringBuilder(s);
            return sb.Replace("&quot;", "\"").Replace("&apos;", "'").Replace("&lt;", "<").Replace("&gt;", ">").Replace("&amp;", "&").ToString();
        }
        #endregion
    }
}
